US Defence Secretary Jim Mattis said today that doing nothing with foreign fighters captured in Syria "was not an option" after a meeting of the US-led anti-Islamic State group coalition in Rome.
During the fierce offensive to oust the IS group from its former stronghold Raqa, Syrian Democratic Forces (SDF) have captured "hundreds" of foreign jihadists, Mattis said.
They say foreign fighters should be to be dealt with in their country of origin.
"The bottom line is, we don't want (the jihadists) to go back on the streets of Ankara, (...) Tunis, Paris or Brussels, (...)," said Mattis following the meeting with 13 of his international counterparts.
"It is an international problem, it needs to be addressed by all engaged."
But several countries do not want the jihadists to return home.
Two Britons said to have carried out numerous beheadings are among the detainees.
Alexanda Amon Kotey and El Shafee el-Sheikh -- suspected members of a jihadist cell known "The Beatles" because of their British accents -- are accused of abducting and decapitating around 20 hostages.
The victims included American journalist James Foley, who was beheaded in 2012.
The question of whether the detainees could be imprisoned at US military's Guantanamo Bay prison was raised, but when asked directly for an answer Mattis declined to comment.
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